Most definately overkill. Get a 250w light.if i have 2 plants in a 2x2x5 cab with a 400w hps
would it be overkill
anyone help with how strong the fan has to be?
400 is hardly a risk, it's a recipe for disaster. Besides making the room uber hot, hes gonna burn the crap out of his plants.I have done a grow in a 2.5x2.5 and it was perfect for a 250w. I was able to put the light 6-8 inches from the tops of my colas. You may want to LST but if you get a 400w you run the risk of running out of vertical space because they need to be further away from the plant tops, also its more heat.